Gas-pump.



Patented Apr. 25, 19H.

R.' WHITAKER n E. LOWE.

GAS PUMP."l

, APPLICATION-FILED 00121, 1907.

R. WHITAKER & E. LOWE.

GAS PUMP,

APPLICATION FILEDA 00T. 1, 1907.

Patented A131225 19u.

Z SHBETS-SHEET 2.

ATTORNEY RICHARD WHITAKER ND ELMER LOWE, OF SIGNORS TO THE BRUNSWICKREFRIGE NEW JERSEY, A CORPORATION OF NEW J NEW BRUNSWICK, NEW JERSEY,As- RATING COMPANY, or NEW BRUNSWICK, EnsEY.

GAS-PUMP.

Specification of Letters Patent.

Patented Apr. 25, 1911.

Application filed October 1, 1907. Serial No. 395,323.

To all wtom it may concern:

Be it known that we, RICHARD WHITAKER and ELMER Lowa-,- citizens of theUnited States, and residents of New Brunswick, in the county ofMiddlesex and State of New Jersey, have invented certain new and usefulImprovements in Gas-Pumps, of which the following is a specification.

The invention relates to improvements in gas-compressing pumps, andpertains more particularly to improvements in pumps of the charactershown and described inthe following Letters-Patent heretofore granted toRichard Whitaker, to-wit: No. 795,014 dated July 18, 1905, No. 795,015dated July A18, 1905, No. 821,563 dated May 22, 1906 .and No. 848,277

dated March 26, 1907 The objects of the present invention are generallyto simplify and increase the efliciency of the pump and the system inwhich the pump may be connected, and more specifically Vto prevent theammonia gas from leaking by the piston and entering the chamber inwhich, with a liberal quantity of lubricant, are contained the eccentricand rod for operating the piston, and to avoid the danger of abnormal orexcessive discharge pressures either in the pump'or the piping or partsconnected therewith, it being entirely convenient in accordance with thepresent invention to prevent the creation of a dischargepressure inexcess of a predetermined limit. These objects and other advantages areattained. by the mechanism hereinafter described and illustrated in theaccompanying drawings, in which:

Figure 1 is a central vertical section of the cylinder portion of acompressor-pump constructed in accordance with and embody# ing ourinvention, the piston being indicated in .its lower position; Fig. 2 isa side-elevation of the same, the piston being indicated in its upper orcompressing position; and Fig. 3 is a top view, partly broken away7 ofthe same. s

ln the drawings, 10 designates the pump cylinder, n11 the piston thereinhaving in it the gas inlet valve l2, 13 the supply pipe for gas, 14 thedischarge pipe for compressed gas, 15 the pressure-valve, and 16 apressurev controlling and relief valve mounted 1n said valve 15 andcapable of operationindependently thereof. y

The piston 11 is of elongated form and provided adjacent to its upperand lower ends with sets of rings 17, 18, between which said piston isformed with a through transverse chamber 19 and an external annularchamber 20 in communication therewith, The chamber 19 is elongatedvertically and always in register with the gas supply pipe 13. Iny theupper or head end of the piston 11 is seated' the gas inlet valvel 12,said. valve having a downwardly and inwardly converging peripheryadaptfed to a correspondingly-formed seat 21 on the piston and a steml22 which extends downwardly through a snugly receiving hole in the upperend of said piston and is exposed below the same inthe gas-chamber 19,wherein the lower end of said stem is provided with a tension spring 23and nut-24. The spring 23 exerts its force to normally hold the valve 12on its seat and'its tension may be regulated by the adjustment of thenut 24 toward 'and from it. llVithin the vertical vplane of the outlinedefined by the valve-seat 21, the piston 11 is formed with verticalports 25 which are in permanent communication with the gas-chamber 19'and up through which the gas, upper side of theliead of the piston whenduring the descent of the latter the'suction thereby created elfects theelevation of the valve 12 from its seat.

The lower end of the piston 11 is formed with the usual socket 26 toreceive the upper end of the customary driving eccentric-rod, said rodas shown in the aforesaid Letters- Patent No. 848,277 being convenientlydriven from an eccentric secured on adriving shaft and inclosed within abase-casing upon which the cylinder 10 is mounted and within which isprovided a liberal supply of oil for lubricating the working partstherein. We do not show the said basecasing with its oil chamber andeccentric nor the whole of the eccentric-rod for driving the piston 11,since they, same are fully shown and described in the aforesaid Patent848,277. The cylinder `10 is vertical and entirely open at its lowerend, as shown in Fig. 1, and at said end is constructed to seat within asocket in said base-casing. A difficulty experienced in the employmentof the pump shown in said Patent 848,277 is thatythel gas will leak downthe sides of the piston and enter the for compression, may pass to thevents the leakage of the` gas into the oilcha'inberY` '1n/thebase-casing and simplifies the pump'and increases its etliciency and theefficiency of the system employing it.

lVithin the lupperl end of the cylinder 10 is a chamber 27 at whose baseis formed, on the inner laterally extended wall of the cylinder, anannular seat 28 for the pressurevalve 15, which is normally held uponsaid vseat by a spring 29 confined between it and the head of thecylinder. The valve 15 is formed in itsperiphery with an annular chamber30, which when said valve is on its seat is in direct communication withthev discharge pipe 14. The chamber 30 is defined by the side wall 31ofthe valve .15, the lower surface lot theiupper encompassing flange 32onsaid valve and the upper surface of the lower encompass- The langesing flange 33 on said valve. 32, 33 are removed at segmental portions oftheir peripheries, as at 3/1 (Fig. 3), to form openings which place thechamber 30 in permanentA `communication with the chamber 27 above the,valve 15 and permit the compressedfgas, upon the elevation of the valve15A from its seat, to enter the p ychamber 30.

In the valve 15 is provided a pressure control yalve '16 whose Vconicalperipheral edge isiadapted to a correspondingly formed seat on .thevalve 15 and whose stem 35 extends 'upwardly through a snugly receivinghole in said valve 15 and has upon its upper portion ay tension spring36 and nut 37, said spring exertingits force to normally ret-ain thevalve 16 on its seat and said nut being providedhto regulate the tensionof said spring'J or 'setthe ,same to resist the opening of thevalvet16funde`rl any normal gas-pressure het..chamberl27l and to permit theopening`-go`fff` valve 16 should, for any reason,the "gafs-,pre ssure insaid chamber become. siv'clor abnormal `or greater than the`predetermined amount therefor. .The valve 15k isformjed withinthevertical plane of the periphery ofthe valve16 with ports 38 which aresealed by thevalve 16 when the latter is on its vseat andl communicatewithv the cylinder 10 below the pressure valve 15 when said valve 1-6 isoil' its seat. The ports 38"always remain `sealed except in the event`of the creation of abnormal gas-pressure in the chamber 27, when thevalve 16 will open and permit such pressure to be" relieved through theports 38.

The valve 16 enables the prevention of a gas-pressure in the chamber 27or discharge plpe 14 or parts connected therewith beyond a predeterminedmaximum degree, and this is of very great. importance in many respects,as, for example, if, in the absence .of the valve 16, the operatorshould set or continue the pump in operationv and neglect to open thevalve or valves in the line lead- 4ing therefroma great and possiblydisastinue in operation without damage. The4 valve 16 thus serves tocontrol the maximum degree of gas-pressure which may be created in thechamber 27 and discharge line by the compressor, any excess of suchpressure being relieved by the opening of said valve thereby.

The operation of the compressor will be largely understood from theforegoing description. The supply-gas will be admitted to the chamber 19in the piston 11, and during each down or suction stroke of the pistonthe valve 12 will open and permit a .proper charge of the gas to passupwardly through the ports 25 to the space above the piston.v Durlngeach 11p-stroke of the piston 11 the .charge of gas above it willbecompressed agtnst the pressure valve-15, which elevating from its seatwill permit the compressed gas to enter the annular chamber 30,

chamber 27 and discharge pipe ,14. Any excess of pressure or pressurebeyond the predetermined limit in the pipe 1'4 and chamber 27 will openthe valve 16 and be relieved thereby. The gas in the su ply chamber 19is sealed at the upper and Ilower ends of the piston by the rings 17,18. A very important advantage derived from the location of the chamber19 intermediate the ends of the piston 11 and scaling the same by therings 17, 18 is that any gas leaking down- Wardly around the upper endof the piston will return to said chamber and enter the.

ends of the same. The lower .rings 18 also tend to prevent the lubricantin the usual acacia .gas became Lmore or less heated by the heatgenerated by the discharge pressure.

What we claim as our invention and de` sire to secure by Letters-Patent,is:

1. In a pump of the character described, a cylinder, a pressure-valvecontrolling the discharge,- an automatic independently operative valvefor relieving abnormal discharge pressures by4 opening a passage, undersaid pressures, leading to the compression side of said pressure-Valve,a piston in said cylinder packed at both ends and having a gas supply7ch-amber between said ends, and a suction-valve in said piston;substantially as set forth.

2. In a pump of the character described, a

cylinder, a pressure-Valve controlling the discharge, `an automatic.independently operative valve for relieving abnormal \dischargepressures by opening a passage,

under said pressures, leading to the compression side of saidpressure-valve, a piston in said cylinder,l a suction-Valve in saidpiston, and means for supplying gas to the passage normally closed bysaid suction- Valve; substantially as -set forth.

3. In a pump of the character described, a

cylinden a pressure Valve controlling the discharge and formed with anannular encompassing chamber and vupper and lower iianges containing'passages for the gas to said annular chamber and the chamber' `abovesaidvalve, a spring normally holding said valve on its seat,aiiindependently operative pressure control .or relief valve seated in saidpressure valve, a spring normally holding said control valve on itsseat,

a piston in said cylinder, a suction-valve iii said piston, and -nieaiisfor supplying gas to the passage normally closed by said suctionvalve;substantially as set forth.

Signed at New Brunswick, New Jersey, this 26th day otSeptember, 1907.

RICHARD VVHITAKER.

ELMER LOWE. Witnesses:

` FRED-M. Joiner,

F. E. @FISI-inn.

